We present results of an observation of the anomalous X-ray
pulsar 4U 0142+61 with the EPIC cameras on XMM-Newton
performed on 2003 January 24. The pulse phase averaged spectrum can
be best described by the sum of a black body with a temperature of
and a power law with photon
index . The unabsorbed 2-10 keV flux is
.
No evidence for additional spectral features such as cyclotron lines
is present. These results are consistent with those from an earlier
Chandra observation in 2001 May. Phase resolved
spectroscopy over the s period (MJD 52 663.93) shows
clear variations with pulse phase of Γ, while kTBB
shows a small variation of ∼12%. We confirm earlier conclusions
by Özel (2001, ApJ, 563, 276) that the emission from AXPs is more like
ly to
originate from neutron stars with one single and magnetically active
region on the neutron star. The significantly different behavior of
the soft and hard spectral components with pulse phase, however,
cannot be fully reconciled with the present magnetar emission
models.

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